Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove connector X5 from the PCB
Disconnect electrical connector to parameter unit

Measurement:

Measure the resistance across each of the wires of the parameter unit harness between pins 10 to 13 of X5 connector and the parameter unit connector.
Expect continuity / zero resistance on each wire.
Note.
The wires at the parameter connector do not run in the same sequence as X5 connector wires.